Deluge torrents that don't have a hash are skipped

In some cases torrents in Deluge may not have a hash (ex: https://torguard.net/checkmytorrentipaddress.php). This causes Sonarr to fail when loading the torrents from Deluge with error message: 'Unable to communicate with deluge. Object reference not set to an instance of an object'. This commit simply causes Sonarr to skip over the torrent with the missing hash and continue loading torrents that do have hashes.

src/NzbDrone.Core/Download/Clients/Deluge/Deluge.cs

@@ -104,6 +104,7 @@ namespace NzbDrone.Core.Download.Clients.Deluge
 
             foreach (var torrent in torrents)
             {
+                if (torrent.Hash == null) continue;
                 var item = new DownloadClientItem();
                 item.DownloadId = torrent.Hash.ToUpper();
                 item.Title = torrent.Name;